feat: flat design Sunset Glitch + download manager + settings + recommendations overhaul

- Sunset Glitch color palette applied to all templates
- Font Awesome icons throughout UI
- Download manager with parallel queue and progress tracking
- Settings page with dynamic configuration
- Recommendations router enhanced with scoring
- Local vendor libs (Alpine.js, HTMX) for offline support
- Auto test suite with screenshots
- Series releases list component
- New download model

app/models/download.py

@@ -0,0 +1,40 @@
+"""Models for download task persistence with SQLModel support"""
+import uuid
+from typing import Optional
+from datetime import datetime
+from sqlmodel import SQLModel, Field, Column, String
+from enum import Enum
+
+
+class DownloadStatus(str, Enum):
+    PENDING = "pending"
+    DOWNLOADING = "downloading"
+    PAUSED = "paused"
+    COMPLETED = "completed"
+    FAILED = "failed"
+    CANCELLED = "cancelled"
+
+
+class DownloadTaskTable(SQLModel, table=True):
+    """Database table for persisting download tasks across server restarts."""
+    __tablename__ = "download_tasks"
+
+    id: str = Field(
+        default_factory=lambda: str(uuid.uuid4()),
+        primary_key=True,
+        index=True,
+        nullable=False,
+    )
+    url: str = Field(default="", sa_column=Column(String))
+    filename: str = Field(sa_column=Column(String))
+    host: str = Field(default="other", sa_column=Column(String))
+    status: str = Field(default="pending", sa_column=Column(String))
+    progress: float = Field(default=0.0)
+    downloaded_bytes: int = Field(default=0)
+    total_bytes: Optional[int] = Field(default=None)
+    speed: float = Field(default=0.0)
+    error: Optional[str] = Field(default=None, sa_column=Column(String))
+    created_at: datetime = Field(default_factory=datetime.now)
+    started_at: Optional[datetime] = Field(default=None)
+    completed_at: Optional[datetime] = Field(default=None)
+    file_path: Optional[str] = Field(default=None, sa_column=Column(String))